Swivel-tip for electric conductors.



No. 845,288. PATENTED PEB. 26, 1 907.

W. P. BARKER. swl'vm 2m FOR ELECTRIC OONDUCTORS.

APPLICATION FILED APE.17 1906.-

UNIT STATE g PATENT FETCH,

SWlVEL-TlP FOR ELEi'JTRlG CQNDUGTQRS.

Specification of Letters Patent.

Patented Feb. 26, 190?.

Application filed April 17, 1906. Serial No. 312.095.

To add whom it may concern:

Be it known that I, WILLIAM F. BARKER, a citizen of the United States, and a resident of Somerville, in the county of Middlesex and.

State of Massachusetts, have invented an E fabric.

Improvement in Swivel-Tips for Electric Conductors, of which the following description, in connection with the accompanying drawings, is a specification, like letters on the drawings representing like parts.

This i11vent-1on.. has for its object the pro-.

duction of a novel and efficient swivel-tip for electric conductors, and while applicable for various purposes it is particularly useful in connection with flexible telephone-cords, the tips of which are held firmly in suitable binding-posts or holders.

It is necessary that the wire or wires forming the conductor and protected by bi'aided or other insulation shall have a perfect electrical connection with the tip, and in many instances the twisting or bending of the conductor is apt to dislodge or break the tip or injure the binding post or screw.

The cords, which are in practice insulated conductors used in telephone practice to connect the receiver and the transmitter with the'main circuit, are, as is well known, subj ect to rather rough usage in handling the instrument, and the cords are frequently twisted or turned in such a manner that the tip is broken or its electrical connection with theconductor damaged.

By my present invention the tip and the conductor. are united by a swivel connection in avery simple yet eiiicient manner, so that any relative twisting of the tip and the conductor will not in any degree Whatever injure the electrical connection between such parts. The tip remains tightly held in the binding-post and the conductor may be twisted or turned at will without loosening the hold or without any danger of breaking the tip.

The novel features of my invention will be fully described in the subjoined specification and particularly pointed out in the following claims.

' Figure 1 is a view in elevation of a swiveltop embodying my invention connected with the conductor. Fig. 2 is an enlarged longitudinal sectional view thereof, the tip being shown in elevation, Fig. 7 3 is a detached view of the tip and the holder therefor in which the tip is free to rotate.

The electric conductor 1, which may he a single wire or a bunch or group of wires, 1s of usual construction covered with. an insulating jacket or cover 2, which in the case of telephone-cords is usually a seamless braided A tubular shell or ferrule 3 is open at one end to receive the insulated conductor with a tight fit, the conductor in practice being forced into the open end of the shell, the other end 4 of the latter having a centralaperture 5, Fig. 2. Through this aperture loosely extends the end of the tip 6, which in practice is a rod oimetal of good conducting properties, the projecting end of the tip being adapted to be held by a binding post or screw or to enter a socket. At its inner end the tip is slightly enlarged to form a head 7, and the headed end is rotatabl y mounted in a metallic holder 8, the holder being preferably slightly tapered, as shown, to prevent any material longitudinal movement of the tip therein, while permitting free rotation of said tip. 1

The larger end of the holder is overturned at 9, Fig. 2, to retain the head of the tip in place. It will be seen from. the drawings that the holder when inserted in the shell or ferrule 3 is considerably shorter than such shell,

the smaller end of the holder in practice abutting against the closed end of the shell.

In assembling the parts the insulation is removed from the end of the cord to expose the conductor, as at 10. Fig. 2. and the bared part is wrapped around the holder 8 and soldered or otherwise firmly affixed thereto to make a good electrical connection. The holder and tip are then inserted. in the open end of the shell and pushed in until the tip projects through the aperture 5, the cud of the holder abutting against the closed end of the shell, as in Fig. 2, and the end. of the con-- ductor is forced firmly and securely into the shell behind the holder. so thatwhcn the assembling is complete the holder is cramped or held fast in the shell. The tip is free to turn. or rotate relatively to the holder and shell, as will he manifest, and as the latter parts are fast with relation to the conductor or cord the l latter can be turned or twisted indefinitely while the tip remains iixcd. A swivel connection is tlmsprovided by the holder hctwecn the tip and the conductor, so that no twisting, hem-ling, or turning of the latter will aiicct the former, and the electrical connection always remains int. act, as some portion of holder in which the tip is rotatably mounted and held from longitudinal movement, and a shell to receive the tip and its holder and having an opening at one end to permit the tip to project therethrough, the conductor being electrically connected with the holder Within the shell.

2. The combination with'e metallic holder and a tip, the latter being rotatably held in the former and extending beyond. the same at one end, of a tubular shell to receive the holder and the end of the conductor, one end of the shell having an aperture througl'i which the extended end of the tip projects, the conductor being electrically connected with. the holder within the shell.

3. The combination with a tubular shell hevingen aperture in its closed end, of a tip extending loosely through the aperture, an

electric conductor inserted and fixedly held in the opposite open end of the shell, and a swivel. connection between the 1st and said 1 onuuctor, inclosed within the shell.

4. The combination with a tubular shell or ferrule having an aperture in its closed end, of a tiplextended loosely through the aperture, an electric conductor inserted and fixedlyheld in the op osite open end of the shell, anda non-rotates e holder for and 1n which the inner end of the tip is rotatably mounted,

said holder being electrically connected with the conductor within the shell.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

WILLIAM F. BARKER.

Witnesses: I

JOHN C. EDWARDS, MARGARET A; FEENEY. 

